package cn.ronghuanet.base.controller;

import cn.ronghuanet.base.domain.AlicloudOSSProperties;
import cn.ronghuanet.base.util.AjaxResult;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.common.auth.CredentialsProviderFactory;
import com.aliyun.oss.common.auth.EnvironmentVariableCredentialsProvider;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.model.MatchMode;
import com.aliyun.oss.model.PolicyConditions;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;

@RestController
@RequestMapping("/oss")
@Api(tags = "OSSController")
public class OSSController {
    @Autowired
    private AlicloudOSSProperties alicloudOSSProperties;

    @GetMapping("/sign")
    @ApiOperation("OSS服务签名认证")
    public AjaxResult doGet(HttpServletRequest request, HttpServletResponse response){
        AjaxResult ajaxResult = AjaxResult.me();
        // 填写Host名称，格式为https://bucketname.endpoint。
        String host = "https://"+alicloudOSSProperties.getBucketName()+"."+alicloudOSSProperties.getEndpoint();
        // 设置上传到OSS文件的前缀，可置空此项。置空后，文件将上传至Bucket的根目录下。
        String dir = "images";

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(
                alicloudOSSProperties.getEndpoint(),
                alicloudOSSProperties.getAccessKey(),
                alicloudOSSProperties.getSecretKey()
        );
        try {
            long expireTime = 30;
            long expireEndTime = System.currentTimeMillis() + expireTime * 1000;
            Date expiration = new Date(expireEndTime);
            // PostObject请求最大可支持的文件大小为5 GB，即CONTENT_LENGTH_RANGE为5*1024*1024*1024。
            PolicyConditions policyConds = new PolicyConditions();
            policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);
            policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);

            String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
            byte[] binaryData = postPolicy.getBytes("utf-8");
            String encodedPolicy = BinaryUtil.toBase64String(binaryData);
            String postSignature = ossClient.calculatePostSignature(postPolicy);

            Map<String, String> respMap = new LinkedHashMap<String, String>();
            respMap.put("accessid", alicloudOSSProperties.getAccessKey());
            respMap.put("policy", encodedPolicy);
            respMap.put("signature", postSignature);
            respMap.put("dir", dir);
            respMap.put("host", host);
            respMap.put("expire", String.valueOf(expireEndTime / 1000));
            // respMap.put("expire", formatISO8601Date(expiration));
            ajaxResult.setResultObj(respMap);
        } catch (Exception e) {
            // Assert.fail(e.getMessage());
            System.out.println(e.getMessage());
            ajaxResult.setSuccess(false);
            ajaxResult.setMessage("OSS服务器内部错误!");
        } finally {
            ossClient.shutdown();
        }
        return ajaxResult;
    }
}
